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  <title>Establishes a new clip region</title>

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</div><hr /><div id="cairocontext.clip" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">CairoContext::clip</h1>
  <h1 class="refname">cairo_clip</h1>
  <p class="verinfo">(PECL cairo &gt;= 0.1.0)</p><p class="refpurpose"><span class="refname">CairoContext::clip</span> -- <span class="refname">cairo_clip</span> &mdash; <span class="dc-title">Establishes a new clip region</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-cairocontext.clip-description">
  <h3 class="title">说明</h3>
  <p class="para">面向对象风格 (method):</p>
   <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>CairoContext::clip</strong></span>
    ( <span class="methodparam">void</span>
    )</div>

  <p class="para rdfs-comment">过程化风格:</p>
  <div class="methodsynopsis dc-description">
   <span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>cairo_clip</strong></span>
    ( <span class="methodparam"><span class="type"><a href="class.cairocontext.html" class="type CairoContext">CairoContext</a></span> <code class="parameter">$context</code></span>
   )</div>

  <p class="para rdfs-comment">
   Establishes a new clip region by intersecting the current clip region with the current path as it
   would be filled by <span class="methodname"><a href="cairocontext.fill.html" class="methodname">CairoContext::fill()</a></span> or <span class="function"><a href="cairocontext.fill.html" class="function">cairo_fill()</a></span>
   and according to the current fill rule (see <span class="methodname"><a href="cairocontext.setfillrule.html" class="methodname">CairoContext::setFillRule()</a></span>
   or <span class="function"><a href="cairocontext.setfillrule.html" class="function">cairo_set_fill_rule()</a></span>).
  </p>
  <p class="para">
    After <span class="methodname"><strong>CairoContext::clip()</strong></span> or <span class="function"><strong>cairo_clip()</strong></span>,
    the current path will be cleared from the cairo context.
  </p>
  <p class="para">
    The current clip region affects all drawing operations by effectively masking out any changes
    to the surface that are outside the current clip region.
  </p>
  <p class="para">
    Calling <span class="methodname"><strong>CairoContext::clip()</strong></span> or <span class="function"><strong>cairo_clip()</strong></span>
    can only make the clip region smaller, never larger. But the current clip is part of the
    graphics state, so a temporary restriction of the clip region can be achieved by calling
    <span class="methodname"><strong>CairoContext::clip()</strong></span> or <span class="function"><strong>cairo_clip()</strong></span> within a
    <span class="methodname"><a href="cairocontext.save.html" class="methodname">CairoContext::save()</a></span>/<span class="methodname"><a href="cairocontext.restore.html" class="methodname">CairoContext::restore()</a></span> or
    <span class="function"><a href="cairocontext.save.html" class="function">cairo_save()</a></span>/<span class="function"><a href="cairocontext.restore.html" class="function">cairo_restore()</a></span> pair.
    The only other means of increasing the size of the clip region is
    <span class="methodname"><a href="cairocontext.resetclip.html" class="methodname">CairoContext::resetClip()</a></span> or procedural <span class="function"><a href="cairocontext.resetclip.html" class="function">cairo_reset_clip()</a></span>.
  </p>
 
 </div>


 <div class="refsect1 parameters" id="refsect1-cairocontext.clip-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">context</code></em></dt>

     <dd>

      <p class="para">
       A valid CairoContext object
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-cairocontext.clip-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   没有返回值。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-cairocontext.clip-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2787">
    <p><strong>Example #1 面向对象风格</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$surface&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">CairoImageSurface</span><span style="color: #007700">(</span><span style="color: #0000BB">CairoFormat</span><span style="color: #007700">::</span><span style="color: #0000BB">ARGB32</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">50</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">50</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$context&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">CairoContext</span><span style="color: #007700">(</span><span style="color: #0000BB">$surface</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$context</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">clip</span><span style="color: #007700">();<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
     </div>

   </div>
  </p>
  <p class="para">
   <div class="example" id="example-2788">
    <p><strong>Example #2 过程化风格</strong></p>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /><br />$surface&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">cairo_image_surface_create</span><span style="color: #007700">(</span><span style="color: #0000BB">CAIRO_FORMAT_ARGB32</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">50</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">50</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$context&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">cairo_create</span><span style="color: #007700">(</span><span style="color: #0000BB">$surface</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">cairo_clip</span><span style="color: #007700">(</span><span style="color: #0000BB">$context</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
     </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-cairocontext.clip-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="methodname"><a href="cairocontext.resetclip.html" class="methodname" rel="rdfs-seeAlso">CairoContext::resetClip()</a> - The resetClip purpose</span></li>
    <li class="member"><span class="function"><a href="cairocontext.resetclip.html" class="function" rel="rdfs-seeAlso">cairo_reset_clip()</a> - The resetClip purpose</span></li>
   </ul>
  </p>
 </div>


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